Dentistry



'- (No Model.)

J. L. WHINERY.

DENTISTRY. No. 328,442. Patented Oct. 13, 1885.

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UNITED STATES PATENT QEETQE.

JAMES L. \NHINERY, OF UNION, IOWVA.

DENTISTRY.

i JPECIFICATION forming part of Letters Patent No. 328,442, datedOctober 13, 1885.

Application filed August 6, 1885. Serial No. 173,731. (No modeLl To allwhom, it may concern.-

Be it known that I, J AMES L. WHINERY, a citizen of the United States ofAmerica, residing at Union, in the county of Hardin, in the State ofIowa, have invented a new and useful Improvement in Dentistry, of whichthe following is a specification.

My invention relates to improvements in processes for replacing orrepairing vulcanized rubber dental plates.

Heretofore the practice has been to repair vulcanized dental plates bypatching them, or uniting to the impaired plate by vulcanization a newpiece of material, the fit and incorporation of which depended largelyon the skill of the professional. Blocks of teeth were reset andfractures united by means of applied coatings of rubber cemented byvulcanizing, which always thickened or distorted the surface of theplate to which applied.

It is the object of my invention to provide a simple, certain, and cheapmethod, whereby a broken or impaired rubber dental plate can beduplicated or replaced. My invention is also adapted to resettingdetached teeth to the plate.

My invention therefore consists in the process or method hereinafter setforth, and specifically pointed out in the claim.

I accomplish the purposes of my invention by a series of successivesteps or acts wherein are used certain means or appliances common to theprofession, but which I have illustrated in the accompanying drawings inorder that the progressive acts may be fully demonstrated andpractically understood.

Reference being had to the drawings as a part of this specification,Figure 1 shows a view of an upper set of teeth with a fractured plate,the pieces of which have been temporarily united by a cement of wax.Fig. 2 shows the same after theimpression-mold has been flasked andtaken out. Fig. 3 shows the plate and teeth in the reverse mold, andFig. 4 shows the plate with the grooves out about its rim or gums, oneof the sides being represented as filled with the wax.

To consummate the purposes of my invention I talkie the impression ofthe plate to be replaced or duplicated by spreading a thin mixtureofiplaster-of-paris in the plate and then insert the plate in positionin the mouth of the patient, pressing it in place, and for the purposeof obtaining a well-defined impression I have the patient bring theteeth together with pressure suiiicient to effect the purpose, and alsothat the articulation may not be changed when the plaster hardens. Wheninduration of the plasterof-paris is effected, the plate is taken out ofthe mouth and the impressed plaster-of-paris trimmed about the edges togive it the shape it is desired the new plate shall have when finished.The appearance of the plate with the thin impressioncoating is shown inFig. 3 of the drawings, wherein the thin impression is shown with a partbroken away, as indicated at a. I then paint the impression with acoating of shellac varnish, and also apply a coating of oil, so thatthemold-plaster to be deposited in the plate will not adhere to thatconstituting the thin impression-mold already in the plate. I then fillthe impression with plaster to obtain the mold of the mouth, and trimthe plaster nicely. I then cut a groove in the gum or rim of the plate,substantially as shown in Fig. at of the drawings at a, the object beingthat the plate shall bend easily, and thuslessen the danger of breakingthe mold when taking it out of the plaster. This groove to is thenfilled with wax, which is trimmed to the contour of the plate or down tothe surface of the rim. I then flask the teeth the same as though a waxplate were being used, and let the plaster harden. The closed flaskcontaining the teeth is then put in the vuleanizer and treated until themercury runs up to 320 Fahrenheit. This treatment must be done with dryheat. During this treatment the waX in the groove will be absorbed bythe plaster. When the treatment has been accomplished as stated, theflask is taken from the vulcanizer and separated. The mold will be foundin one part and producing a facsimile of the impressionplate,substantially as seen in Fig. 2 of the drawings, and the teeth and platewill remain in the other, substantially as seen in Fig. 3 of thedrawings, which shows the teeth fixed in the plaster and the thinimpression-plate adhering to the plate. I then carefully remove therubber while hot, it being quite soft then. I also remove all pieces ofthe thin impression-plaster, most of which will be adhering to therubber plate. When the rubber and thin impression-plaster have thus beenremoved, the teeth are ready for the'new rubber, and this is put on bypacking it where the old has been removed from. When thus packed, theflasks are united, put into the vulcanizer, and treated as is usual, theresult reached being that the teeth have been reset to a new plate.

Should the plate to be replaced be fractured, the parts may be heldtogether by a wax cement and the plaster poured into the plate, whichgives the mold of the mouth, and then the process is carried out asheretofore described.

The invention, it will be seen, is equally applicable to resettingblocks of teeth which have been broken from the plate.

WVh-at I claim as my invention, and desire to secure by Letters Patent,isa The process for replacing, duplicating, or repairing rubber dentalplates, which consists in first depositing in the plate to be renewed orreplaced a thin impression-cast of suitable plastic material, thenfilling in the plate on the thin impression-cast with a plastic mold,then cutting a groove in the exterior rim of the rubber plate andfilling said groove with wax, then flasking the teeth in a plaster mold,then subjecting the closed flask and contents to dry heat to devulcanizethe rubber, then removing the devulcanized plate and replacing its moldwith packed rubber, and then vulcanizing the same, all substantially asset forth.

In witness whereof I have hereunto set my hand in the presence of twoattesting witnesses.

JAMES L. WHINERY.

Witnesses:

B. J. PARRISH, J. H. MODILL.

